EP 1953752 B1 20140507 - EMBEDDING AND DETECTING HIDDEN INFORMATION
Title (en)
EMBEDDING AND DETECTING HIDDEN INFORMATION
Title (de)
EINBETTEN UND DETEKTIEREN VON VERSTECKTER INFORMATION
Title (fr)
INCORPORATION ET DÉTECTION D'INFORMATION MASQUÉE
Publication
Application
Priority
- CN 2006002409 W 20060915
- CN 200510103221 A 20050916
Abstract (en)
[origin: EP1953752A1] A novel method is disclosed for embedding hidden information in a document comprising characters, comprising: selecting at least one channel corresponding to a class of layout transformation to represent the hidden codes to be embedded into the document, wherein each class of layout transformation includes N levels, and N is an integer greater than or equal to 2, and the values of N for different classes of layout transformation can be the same or different; for each of the selected channels determining a code sequence of hidden codes for the class of layout transformation to which the channel corresponds, wherein a positive integer M stands for the length of the transformed hidden codes; selecting K characters that will be subjected to the layout transformation from the document comprising characters, wherein K is a positive integer and K ‰¥ M; and performing layout transformation on the selected K characters according to the determined code sequence. The method for embedding and detecting hidden information in electronic documents that mainly include characters is significantly interference-proofing and highly tolerates varieties of interference patterns.
IPC 8 full level
CPC (source: EP US)
G06T 1/0064 (2013.01 - EP US); H04N 1/32203 (2013.01 - EP US); H04N 1/32219 (2013.01 - EP US); H04N 1/32229 (2013.01 - EP US); H04N 1/32288 (2013.01 - EP US); H04N 1/32299 (2013.01 - EP US); H04N 1/32336 (2013.01 - EP US); G06T 2201/0062 (2013.01 - EP US); H04N 2201/3283 (2013.01 - EP US); H04N 2201/3284 (2013.01 - EP US)
Citation (examination)
- US 5530751 A 19960625 - MORRIS DALE C [US]
- US 6101602 A 20000808 - FRIDRICH JIRI [US]
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1953752 A1 20080806; EP 1953752 A4 20091230; EP 1953752 B1 20140507; CN 1933391 A 20070321; US 2008310672 A1 20081218; US 2013028466 A1 20130131; US 8311265 B2 20121113; US 8538068 B2 20130917; WO 2007031031 A1 20070322
DOCDB simple family (application)
EP 06775665 A 20060915; CN 200510103221 A 20050916; CN 2006002409 W 20060915; US 201213629599 A 20120927; US 5005508 A 20080317